At first a lot of exchanges result in a lot of fragmentation in terms of volume. Its better to start off with one strong market and grow slowly from there.
Many traders prefer to work with local exchanges. Some traders want to have some choice of exchanges because they prefer to work with concrete exchanges. But in all cases it is necessary to start listing from big exchanges
I agree that it is not enough to be listed only at one exchange. But it is necessary to start somewhere. It must be simple for users to buy tokens.